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A278689 as a simple table

na(n)
00
11
24
325
4170
51204
68736
764416
8480480
93615040
1027382784
11208539136
121595216896
1312247746560
1494330470400
15728474664960
165638832087040
1743737154928640
18339856038297600
192645063771750400
2020615846154731520
21160889637246074880
221257082279931412480

[0,1,4,25,170,1204,8736,64416,480480,3615040,
 27382784,208539136,1595216896,12247746560,
 94330470400,728474664960,5638832087040,
 43737154928640,339856038297600,2645063771750400,
 20615846154731520,160889637246074880,
 1257082279931412480]